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We grey-out the non-current step in the tour so the user knows whether they’re at step 1, 2, or 3. This is done using CSS opacity. IE8 doesn’t support the standard CSS opacity syntax. But it does support the weird, old, Microsoft-specific `filter:` syntax. So this commit: - makes the greying out a class rather than an inline style, to reduce duplication - adds the filter syntax so the greying out works in IE8